Bulk storage type

Hi Exeperts,

I am picking material against a outbound delivery and system is proposing bin on the basis of sorting bins alpha wise. (First bin it is suggesting D and later E)I have stock of same material in single bulk storage type with FIFO removal with same batch, same SLED, same GR date and same last movement date with different quant numbers... While creating TO against OBD, it is picking storage bin sequesnce wise but not oldest quant wise.

Can you suggest how to change these settings, so that it has pick oldest quant wise from this SU managed bulk storage type...